Add `find_framework()` method to compiler object #14662

Job	Run time
Arch Linux	16m 0s
CUDA (on Arch)	5m 40s
Arch / PyPy	20m 4s
Fedora	20m 12s
Ubuntu Rolling (gcc, g++)	16m 48s
OpenSUSE	16m 27s
Ubuntu Rolling (--unity=on -Ddefault_library=static, --no-unittests, gcc, g++)	10m 48s
Ubuntu Bionic	15m 1s
Ubuntu Rolling (-Ddefault_library=both, --no-unittests, gcc, g++)	10m 52s
Ubuntu Rolling (clang, clang++)	18m 33s
Ubuntu Rolling (--unity=on, --no-unittests, clang, clang++)	12m 35s
Ubuntu Rolling (--cross ubuntu-armhf.json --cross linux-mingw-w64-64bit.json, 0, gcc, g++)	10m 59s
Ubuntu Rolling (--cross ubuntu-armhf.json --cross linux-mingw-w64-64bit.json, --unity=on, gcc, g++)	10m 46s
	3h 4m 45s

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